What is chronic autoimmune thyroiditis?

Hashimoto's, most common cause of hypothyroid in iodine sufficient areas, cell-antibody destruction of thyroid, two forms goitorus and atrophic (differ in lymphocytic infiltration/fibrosis/follicular cell hyperplasia but not pathophysio) High anti-TPO Ab or thyroid Na/I transporter in 90% of pt Usually permenant (not always), and pt have family history of other autoimmune diseases